2686. Another flattened, disc-like stone. Triple phosph. and phosph. of lime. Concentric markings like the last. V 4"'.
2687. Chalky, oblong concretion. Phosph. of lime and triple phosph. Outer portion arranged in laminae. I" 4'" by 10'".
2688. Urethral calculus, from a case of abscess of the pros- tate, etc. (No. 2876). Form somewhat irregularly ovoid ; and measures J-f in. by fa in. Surface fawn-colored, smooth, and toward the large extremity polished to some extent. There is also shown another small stone, that was removed at the same time ; 2 by 1 \ lines, flattened, and having both surfaces quite polished, as if by attrition against the large one. The large calculus is evidently phosphate upon the surface ; but it has not been analyzed, as, on account of its size, it was desirable to preserve it entire. 1868. Dr. H. J. Bigelow.
2689. A calculus from the bladder of a child, who was trans- fixed by a hay -hook (No. 3116). Examined by Dr. Ba- con, who remarked that it was evidently of rapid forma- tion. Length nearly f in., and thickness -| in. Exterior rough, with small tubercular projections. On section, it is seen to be hollow. The shell is about a line in thick- ness, and is composed of triple phosphate and phosphate of lime, with considerable animal matter. The large cav- ity within contains only a thin, shrivelled membrane, loosely adherent to the walls, and probably the remains of a slough. 1857. Dr. J. P. Maynard, of Dedham.
2690. A few, minute, rounded, compact, white calculi, that were passed from the urethra ; the largest about the size of a duck-shot. Surface not rough nor crystalline. "Phosph. of lime, with a little triple phosph.," according to Dr. Bacon. No. 1339 in the Med. Soc.'s Cabinet were from the same subject ; a gentleman, set. about twenty-five, who was subject to acidity of the stomach, and had often passed such calculi as are here shown, but was otherwise healthy. 1859. Dr. S. D. Townsend.
2691. Nucleus is a piece of coal or coke, coated '"with carb. and phosph. of lime and triple phosphate. 9'" by 6'". 1847.
Dr. J. C. Warren.
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